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用化学沉积法制备Ni-W-P合金镀层。利用扫描电镜(SEM)及X射线衍射(XRD)技术,并结合JADE软件定量分析镀层微观组织特征,研究了退火晶化前后显微组织对镀层耐磨性的影响。结果表明,化学沉积Ni-5.24wt%W-6.71wt%P镀层镀态下的晶化程度约为24%,退火温度升高到700℃时,晶化程度约为94%,未达到完全晶化。在Ni3P相晶化反应温度下,Ni3P相的晶粒尺寸大于Ni相,高于其晶化温度时,Ni相晶粒尺寸大于Ni3P相。退火温度超过600℃时,两相的晶粒尺寸迅速粗化。镀层磨损率随退火温度的升高而减小,500℃时出现最小值,超过500℃时,磨损率又开始增大。镀层较高的耐磨性除了与其硬度有关外,还取决于适当的晶化程度和较小的晶粒尺寸。
Preparation of Ni-W-P Alloy Coating by Chemical Deposition. The effects of microstructure on the wear resistance of the coating before and after annealing were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and JADE software. The results show that the degree of crystallization in electroless Ni-5.24wt% W-6.71wt% P coating is about 24%. When the annealing temperature is increased to 700 ℃, the degree of crystallization is about 94% The At the Ni3P phase crystallization temperature, the grain size of the Ni3P phase is larger than that of the Ni phase, and above the crystallization temperature, the grain size of the Ni phase is larger than that of the Ni3P phase. When the annealing temperature exceeds 600 ℃, the grain size of the two phases rapidly coarsens. The wear rate of the coating decreases with the increase of the annealing temperature, and the minimum value occurs at 500 ℃. When the temperature exceeds 500 ℃, the wear rate begins to increase again. In addition to its hardness, the higher wear resistance of the coating is also dependent on the degree of crystallinity and the smaller grain size.